A scene from Grimm’s season finale, "Kiss of the Muse," with David Giuntoli as Nick Burkhardt, Russell Hornsby as Hank Griffin. (NBC/Scott Green)

“The Ghost Army” (WETA at 8 p.m.), a documentary, tells the story of a top-secret World War II mission in which a group of American G.I.s in France used everything from rubber tanks to sound effects to create an illusion and trick the enemy into thinking a huge army had arrived.

“The Reagan Presidency” (MPT at 8), a three-part series, airs on Maryland Public Television on Tuesday and Wednesday, beginning with a look at Ronald Reagan’s domestic and foreign policies and featuring interviews with political leaders and scholars.

Scorned “Bachelor” contestant Desiree will return next week as the current “Bachelorette,” ready to have her pick of 25 eligible men — but first, we must sit through a clip show of “The Bachelor’s Funniest Moments” (ABC at 8).

FINALE WATCH: “Dancing With the Stars” (ABC at 9) Status: Renewed. Not much buzz came from this edition’s crop of contestants (save for Andy Dick actually being pretty entertaining), but anything was better than the previous “all star” season. In the finale, the final couples perform once more for the judges, and the winner receives the hideous-yet-coveted Mirror Ball Trophy at the end of the two-hour spectacle.

Two more singers are eliminated on results night of “The Voice” (NBC at 9), as the march toward the season finale begins.

The next episode of “Constitution USA With Peter Sagal” (WETA, MPT at 9) looks at the 14th Amendment across the country, and how it affects everything from same-sex marriage to voting rights.

FINALE WATCH: “Grimm” (NBC at 10) Status: Renewed. One of NBC’s few bright spots last year, the show proved to excel on Friday nights — so much that the network moved it to the coveted post-“Voice” Tuesday slot for the last part of the season. Now, the second season ends as Nick is tasked to investigate attacks in Portland that are allegedly the result of the “undead” causing problems; later, he’s required to get help from Monroe and Rosalee to solve the case.

It’s time for a school dance on “Awkward” (MTV at 10), which brings up some bad memories for Jenna when she reminisces about other school events.

Piedmont Bird Callers are on “The Late Show With David Letterman” (CBS at 11:35), along with actor Jason Bateman and singer John Fogerty.

Actor Eric Stonestreet, TV host Jeremy Wade and country duo Thompson Square are on “The Tonight Show With Jay Leno” (NBC at 11:35).

“Jimmy Kimmel Live” (ABC at 11:35) hosts actor Ethan Hawke, upcoming “Bachelorette” star Desiree Hartsock and a performance by Thirty Seconds to Mars.

— Emily Yahr